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Merge branch 'ext3-latency-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 

* 'ext3-latency-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext3: Add replace-on-rename hueristics for data=writeback mode
  ext3: Add replace-on-truncate hueristics for data=writeback mode
  ext3: Use WRITE_SYNC for commits which are caused by fsync()
  block_write_full_page: Use synchronous writes for WBC_SYNC_ALL writebacks
This commit is contained in:
Linus Torvalds 2009-04-03 11:10:33 -07:00
parent 18b34b9546 e7c8f5079e
commit 20bec8ab14
8 changed files with 38 additions and 11 deletions
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5
fs/buffer.c
View File

@ -1595,6 +1595,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
struct buffer_head *bh, *head;
const unsigned blocksize = 1 << inode->i_blkbits;
int nr_underway = 0;
int write_op = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : WRITE);
BUG_ON(!PageLocked(page));
@ -1686,7 +1687,7 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
do {
struct buffer_head *next = bh->b_this_page;
if (buffer_async_write(bh)) {
submit_bh(WRITE, bh);
submit_bh(write_op, bh);
nr_underway++;
}
bh = next;
@ -1740,7 +1741,7 @@ recover:
struct buffer_head *next = bh->b_this_page;
if (buffer_async_write(bh)) {
clear_buffer_dirty(bh);
submit_bh(WRITE, bh);
submit_bh(write_op, bh);
nr_underway++;
}
bh = next;

4
fs/ext3/file.c
View File

@ -33,6 +33,10 @@
*/
static int ext3_release_file (struct inode * inode, struct file * filp)
{
if (EXT3_I(inode)->i_state & EXT3_STATE_FLUSH_ON_CLOSE) {
filemap_flush(inode->i_mapping);
EXT3_I(inode)->i_state &= ~EXT3_STATE_FLUSH_ON_CLOSE;
}
/* if we are the last writer on the inode, drop the block reservation */
if ((filp->f_mode & FMODE_WRITE) &&
(atomic_read(&inode->i_writecount) == 1))

3
fs/ext3/inode.c
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@ -2363,6 +2363,9 @@ void ext3_truncate(struct inode *inode)
if (!ext3_can_truncate(inode))
return;
if (inode->i_size == 0 && ext3_should_writeback_data(inode))
ei->i_state |= EXT3_STATE_FLUSH_ON_CLOSE;
/*
* We have to lock the EOF page here, because lock_page() nests
* outside journal_start().

6
fs/ext3/namei.c
View File

@ -2274,7 +2274,7 @@ static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
struct inode * old_inode, * new_inode;
struct buffer_head * old_bh, * new_bh, * dir_bh;
struct ext3_dir_entry_2 * old_de, * new_de;
int retval;
int retval, flush_file = 0;
old_bh = new_bh = dir_bh = NULL;
@ -2410,6 +2410,8 @@ static int ext3_rename (struct inode * old_dir, struct dentry *old_dentry,
ext3_mark_inode_dirty(handle, new_inode);
if (!new_inode->i_nlink)
ext3_orphan_add(handle, new_inode);
if (ext3_should_writeback_data(new_inode))
flush_file = 1;
}
retval = 0;
@ -2418,6 +2420,8 @@ end_rename:
brelse (old_bh);
brelse (new_bh);
ext3_journal_stop(handle);
if (retval == 0 && flush_file)
filemap_flush(old_inode->i_mapping);
return retval;
}

23
fs/jbd/commit.c
View File

@ -20,6 +20,7 @@
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/bio.h>
/*
* Default IO end handler for temporary BJ_IO buffer_heads.
@ -171,14 +172,15 @@ static int journal_write_commit_record(journal_t *journal,
return (ret == -EIO);
}
static void journal_do_submit_data(struct buffer_head **wbuf, int bufs)
static void journal_do_submit_data(struct buffer_head **wbuf, int bufs,
int write_op)
{
int i;
for (i = 0; i < bufs; i++) {
wbuf[i]->b_end_io = end_buffer_write_sync;
/* We use-up our safety reference in submit_bh() */
submit_bh(WRITE, wbuf[i]);
submit_bh(write_op, wbuf[i]);
}
}
@ -186,7 +188,8 @@ static void journal_do_submit_data(struct buffer_head **wbuf, int bufs)
* Submit all the data buffers to disk
*/
static int journal_submit_data_buffers(journal_t *journal,
transaction_t *commit_transaction)
transaction_t *commit_transaction,
int write_op)
{
struct journal_head *jh;
struct buffer_head *bh;
@ -225,7 +228,7 @@ write_out_data:
BUFFER_TRACE(bh, "needs blocking lock");
spin_unlock(&journal->j_list_lock);
/* Write out all data to prevent deadlocks */
journal_do_submit_data(wbuf, bufs);
journal_do_submit_data(wbuf, bufs, write_op);
bufs = 0;
lock_buffer(bh);
spin_lock(&journal->j_list_lock);
@ -256,7 +259,7 @@ write_out_data:
jbd_unlock_bh_state(bh);
if (bufs == journal->j_wbufsize) {
spin_unlock(&journal->j_list_lock);
journal_do_submit_data(wbuf, bufs);
journal_do_submit_data(wbuf, bufs, write_op);
bufs = 0;
goto write_out_data;
}
@ -286,7 +289,7 @@ write_out_data:
}
}
spin_unlock(&journal->j_list_lock);
journal_do_submit_data(wbuf, bufs);
journal_do_submit_data(wbuf, bufs, write_op);
return err;
}
@ -315,6 +318,7 @@ void journal_commit_transaction(journal_t *journal)
int first_tag = 0;
int tag_flag;
int i;
int write_op = WRITE;
/*
* First job: lock down the current transaction and wait for
@ -347,6 +351,8 @@ void journal_commit_transaction(journal_t *journal)
spin_lock(&journal->j_state_lock);
commit_transaction->t_state = T_LOCKED;
if (commit_transaction->t_synchronous_commit)
write_op = WRITE_SYNC;
spin_lock(&commit_transaction->t_handle_lock);
while (commit_transaction->t_updates) {
DEFINE_WAIT(wait);
@ -431,7 +437,8 @@ void journal_commit_transaction(journal_t *journal)
* Now start flushing things to disk, in the order they appear
* on the transaction lists. Data blocks go first.
*/
err = journal_submit_data_buffers(journal, commit_transaction);
err = journal_submit_data_buffers(journal, commit_transaction,
write_op);
/*
* Wait for all previously submitted IO to complete.
@ -660,7 +667,7 @@ start_journal_io:
clear_buffer_dirty(bh);
set_buffer_uptodate(bh);
bh->b_end_io = journal_end_buffer_io_sync;
submit_bh(WRITE, bh);
submit_bh(write_op, bh);
}
cond_resched();

2
fs/jbd/transaction.c
View File

@ -1440,6 +1440,8 @@ int journal_stop(handle_t *handle)
}
}
if (handle->h_sync)
transaction->t_synchronous_commit = 1;
current->journal_info = NULL;
spin_lock(&journal->j_state_lock);
spin_lock(&transaction->t_handle_lock);

1
include/linux/ext3_fs.h
View File

@ -208,6 +208,7 @@ static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
#define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
#define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
#define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */
#define EXT3_STATE_FLUSH_ON_CLOSE 0x00000008
/* Used to pass group descriptor data when online resize is done */
struct ext3_new_group_input {

5
include/linux/jbd.h
View File

@ -552,6 +552,11 @@ struct transaction_s
*/
int t_handle_count;
/*
* This transaction is being forced and some process is
* waiting for it to finish.
*/
int t_synchronous_commit:1;
};
/**